Method of color photograph and photographic elements



Jifly 3,1923. 1.460.673

M. c. HOPKINS METHOD OF COLOR PHOTOGRAPHY AND PIiOTOGRAPHlC ELEMENTS Filed May 6, 1916 2 Sheets-Sheet l WE A CL EA R Julv 3,1923. 1.460.673

M. C. HOPKINS METHOD OF COLOR PHOTOGRAPHY AND PHOTOGRAPHIG ELEMENTS Filed May 6, 1916 2 Sheets-Sheet 2 W [Ni/6% ATTORNEY cally and on an exaggerated scale a re ferred form of my invention, but it wil be understood that various modifications of structure and method may be made within the scope of my claims without departing from the spirit of my invention.

Fi 1 is a perspective view of a photograp iically sensitive film showing the coat ing broken away.

Fig. 2 is a face view of the green lined film.

Fig. 3 is a face view of the red lined film.

Fig. 4 is intended to represent on an enlarged scale. a small portion of a colored subject which is to be photographed, and may be considered, for the sake of simplicity of illustration, to be made up of squares of black and whitcand the two colors red and green, practical complementary colors of the spectrum.

Fig. 5 represents a negative obtained by photographing the subject shown in Fig. 4 through a liltcr capable of transmitting mainly the red rays of light on a panchronia'l'ic or other suitable red sensitive photographic element.

6 represents similarly the negative produced by the use of a green filter on a green sensitive or a panchromatic plate.

'5 shows a positive printed with red light from the red color value negative shown in Fig. 5 onto the green lined film of Fig.

Fig. 8 shows a positive printed from the green color value negative of Fig. 6 onto the red lined film of Fig. 3, a green filter being interposed ii the emulsion is red sensitive.

Fig. 9 shows the result of superimposing the printed red and green lined films repre sented in Fl 7 and S, the combined films when properly illuminated appearing to the eye as colored similarly to the object illustrated in Fig. i.

Fig. i shows a section on line m--ar of Fig. 2? of the two components when superimposed but without photographic material thereon.

Figure 11 is a perspective view of a. modified form of my film showing" the coating broken laway.

Figures 12 and 13 are transverse sectional viewsfiof further modifications."

Fi ure 14 is a diagrammatic view of a. smal portion ofa colored chart or test objecton an enlarged scale.

Figure 15 represents, on a large scale, a negative obtained by photographing the subject shown in Figure it through a magenta orminus-green filteron to a panchromatic plate.

Figure 16 represents a negative taken siniiiariy through a blue-green or minus-red iii tar.

Figure 17 represents similarly the negabe superimposed. and the ima es re whereupon a color photograp results.

tive obtained when using a. yellow or minusblue filter.

Figure 18 shows, on a still larger scale, a positive printed from the negative shown in Figure 15.

Figure 19 shows similarly a positive printed from the negative shown in Figure 16.

Figure 20 shows similarly a positive 0bteined by printing from the negative shown in Figure l7.

Figure 21 shows the final positive obtained by superposition of the positives shown in Figures 18, 19, and 20.

In the practice of m invention a set of separation negatives o the subject should first be recorded either simultaneously or successively on ordinary but suitably sensi' tized photographic elements by light passing through proper filters, which are preferably of such colors that the additive product of the light rays passing through all the filters is substantially whlte, i. e., the filters have substantially complementary colors if a two color process is to be employed. From each of these negatives a positive is prepared upon one of my sensitive com onents having mono-color screen areas w ich are it proximately complementary in color to t e color of the filter through which was taken the negative being printed, this positive being so printed that only the portion of the surfaceof the sensitive componentnot having on it colored screen areas bears the hotographic positive, as may be aocom )lis ed, for instance, by printing through' ,t e back of a transparent componenthaving a layer of sensitive material over the separated color areas by it cannot penetrate through the screen areas and therefore can only form the positive in the spaces between the color areas, the ortions of the positive obtained, there re, being interspersed between the screen areas. Upon developing, fixing and finishing the positives by ordinary operations, they ma istere In order that the construction of my preferred types of photographic components may be understood, reference is made to Fig. 1, which illustrates a transparent or translucid support 1 of a suitable material, such as film base, glass or paper havin thereon separated areas 2 of a color designed to serve as a light screen. As here illustrated, these areas are reduced by permeating a film base to a slight depth with dye. For the complementary components, I provide as shown in Fig. 2 a film support bearing green color areas 3 and, as shown in Fig. 3, a further support having red color areas 4 thereon.

The color screen areas on each film componcllt. which preferably embody geometrical designs or other substantially uniform means of light of such a color that I Eli;

magma z iransi spacer-s arr not but, act in W111 wiiil flw dual 1% .1 u: of tinauppmt ihwugh the net-essay this mnulgvnwnt. wqmrvpr h [u inlvrswst iiw same Nahum;

n: vi'iiib'l'flliUH 1'. suppmt part 1 mnrle's 11w i and he Fuppwt part 1* van-ri s the: 00%; unit; 4*. In Figura 15! I haw: shown a mum iimiinn ii-swim 5M Ms spm'? parts I and 1 many fin: svnaiiiw 1:1}01'5 6" and L3, while the color or filter units or areas, 3 and 4, are carried h the support part 1 Theovetios ly. the color of each screen should be complementary to that of the other screen, so that if one screen involves a given portion of the visible spectrum, as, for example, the green-blue wave lengths, the other screen would comprise the remainder of the spectrnm to which the photographic element associated with it is sensitive. The screen colors, however, must be selected as the result of comparison between various practical fnotors tending: to affect the (heraeter of the pieture. For example. I find that in a two-color process it is desirable to use colors herein specified as the mono-eolors red and green, but actuall y comprising colors involving mainly the red-orange and the bluegreen portions of the spectrum. Hence, the ex Jression oon'iplernentary colors will be usotl throughout this specifirstion to cover in ahroacl, *ners} and non-technical. those were lzngths of tight to which the photographic. elements are sensitive and whieh involve rnrtionlly those which are snhstnntiel y complementary and accomplish the '"iurposes of my invention. The terms real and green will similarly he employed to rover any suitable eonipleinern tsry colors, es equivalents, while the rxpression monorolor will beutilizerl to indicate that a single eoior efi'eetn )on the eye is pro- (lubed anal that two visually different colors are not used in the some locality.

It is obvious that the manner of preparing; the color lines depends on the nature of the support, and may he ai'rcomplishm'l in various ways. For the sakeof elearness of illustration the following inethori may he adopted in case the support is mails of nitriieellnlose or a usual type of film base. Lines printed on the support in a. resist ink by s siiitahle press. sfter which the renininii'ig posed. surfers is seen the lines is (iyerl the proper oolor. the dye probably penetrab ing somewhat into i. n,- iilm base, shown. roughly in i, The resist ink is then removed by a solvent that will not n'mterinlly affect the film hose and the dye, thus lee ing the dyed lines 2 with the clear spas Herebetvveen. After the color lines have en produced, the sensitive material *3- is )laoed on the film in any suitable way. owever, so far as the general structure set forth in my claims is concerned, it is immaw. terial by what process the lined components ma be prepared.

Zllthough l have described specifically my invention as roletoci to s two-eolor process, it is obvious that it is applicable to a three color or a multi-color process as well. If three-color values are to be recorded, a third color separation negative prepared and a positive made therefrom in the manner shove zle'aserilierl on :1 screen piste having in 1b lines of a color (omplementary to that of the oolor value oi the negative, the lines being positioned at an angle to each of the diree-- tions normally assumed by the lines on the other plates. The three positives when 6 on pletelil have but to he superimposed. with the images in registry, to constitute 51- pistol-i: in colors.

In Figure A I have shown on an enlarged scale a chart having a red area 30, blue urea 31, green area 32, white urea, 33, and black area 34. If this is photi'igrapheri on a Pen ehrinnntio plate through a. minus hits? and n negative is made in the there will result a black area 35 nmi areas 36 and 37, the latter correspona? Silniisrly, the negative indicated in FigiiTQ 16 IS obtained by using a minus-red filter so that black urea 39 and elem ares. s

Figure 17 represents the through a minushhis filter result hsino clear areas 40 and 41 and area 42. llhese negatives iv-sieoi printed upon. green lineii, l v linecl positive films in. a way ti readily uni'lerstoerl from the l ser the ljWG-lffllfli process hereinahiwe results being mi in Figures in i.

Dnringprsntin "he one. of tivo positive elesnen M w is are placed at l. angles relative to the vertical lines o the negative images. li refershly, angles are such that "when images are registered as shown v iii, the respertive color lin other at angles of 60 rlegr le -motion is, of limited to no in angle or pet ern. in Figs 1 spares led at 44., the at 43. and the l Mk at i 1%) the ulnar span-es ere iiniieunril vi 271 l reil. spores at it}. and the hiss Iln Figure 5 5:? ihe rlrnr spa e 50, the nine spin 18 l9 enil nil are super-posse st Figure arses wherever i i! tive elements. Thereareas wherever the. roior another. for instance. it e re l 3i! 0%? the 9% chart. in the l E. :ii in Ztlifi. Ilia or 11. will thus he clear that p1 s is adapted to multiple eolor p ij rrsses as to the two-color form hrreinnhsve lf$4 riherl.

in order to rsrry out in proeess, if a. tin rolor reroril is to he ninth; in; means of the ",{YEFH uni roll lineil screen films. or other rom -neW homing silver enmlsion, as Clii' i the following qenero. steps given rolor so ijeet. having l 8. white 9, black 1 Mill ni =l rlingremnistinally in phriil on a. panrhronr per or other photonrsphir el i sensitized to the reel or lion oil the spertrurn. A suitable ray liter. rupuole or" trio ting red and ornngo iiilil :unnuent of the remaining light that the resulting 'i'ie gatiio will record mainly the red-orange nos of the suhject interposed in of light. A second negative of the sinne suhje t. prefershly iousls r with the reoorrling of the red 1 still ii in is not lining: n'hoi'ogrz iplied,

I'rnnif 1' on a. {llHi-Qtfi'itlJllili lement whirh sensi tireii to green and blue, 0 filter being nsml whirh trunsirils mainly green and hlue' light. hose plates expose-:1 to tho red arul gr en rays, are to he treated in any suitable monnor es lo; tlnwlonmg and: lining in proper lmtns to malts negatives hearing hlaolr and W nother types of images. surh that positi es may he malls therefrom, as by proje-rtion or rontart. printing. l prefer to metro these negatives the reverse of earh other. that the po itive images may he illffilFF- l in cor-tart. anal 53. it will he soon in l. o reil and White parts 1hr (Fig. ll ere trnnsm'ittsrl. through fie reil filter. resulting after le relopnirnt in light resisting or an opaque rlniosit E? on the portion of the negative :1 eetwl by these rays. As insufiicient amount of aotinio light passes through the red filter from the black and green portions of the subject to affect the sensitized emu? sion materially, there results the formation of a deer spare i3 on the developed negatires.

i iniilnrly. an opaque silver deposit i4 (Fig. 6} remains after development where the seironil negative has been affected by the rays from the white and green portions of the object (Fig. 4) which passes through the green filter, and nclear space 15 results from the fast that no actinic rays from the iii-iii him-r. portions are transmitted. ons wa -prise insrol "ailmmotnres throw. 3

croniplemontarily colorerl filters. and developing anti finishing them by the usual methods.

Tho next essential step in the, process inrolros rinting the negative images on my color screen components to form the color positives, flllil may he accomplished in the following general. manner: The negative image (Fig. :o room-(ling: the red color values of the ohjert, is printed on the green lined sr-roen roznponont (Fig. by light c0mprising mainly the lEIl portion of the spectrum, or ll) light whit-l1 has surh a relation to the color of the screen that it will be intercrptecl hy the green lines to prevent an imam: appearing on the sensitive emulsion 21th the (rolorml areas. thus producing a. positive image of a Hill color value between the green lines. The positive image is derelopeil and otherwise rendered permanenthy the ordinary photo raphic operations inrol'iprl in block and wiiito photography.

From the foregoing. it. will he seen that it is the areas of sensitive film 6 shove the wirnloxw: 5. which are the essential elements in the image formation. They are sharply dislinguishrrl, hoth in position and function, from the sensitive portions of the layer 6 (lirr-rtly over the colored areas 2. Furthermore. while I have illustrated the colored fillrrs E? and the wini'lows or clear spaces 5 as integral with the support 1. they are both in lorntion nnil function distinct from snch support and are separate elements of the invention. It will further be seen that the e tial portions or areas of the sensitive layer 6. whit-h are above the windows or clear elements 5. are alternated with the roior filters or elements 2 when considered with respect to the light used in printing. While those sensitive nreas'ahove the clear 5 are not shown in the same plane as the onion filters .3. they are contiguous to a, common plumnnil are interspersed for prartirsl purposrs in performing their funetions.

Referring to Figs. 2, 4 and 7. and considering the z'iegative (Fig. and the green linerl filnrmmponent (Fig. 2) as superimposed for printing by light. passing through the negative to the lined film, it will be seen that; the rlark portion 1:2 tends to shut oil the rays of light, so that the emulsion (I i? 7) beneath the upper half 1.6 of the green ines toe reiowsl i the a from. the emu of a subject wherein color positive images are intermingled with black and white posi tivc inmgjcs of Hllll'll stvopcr tonc graduation than that of the l'fillll'tll images.

It; is (llllltllll to nllllfl two sou-olive r-mill Sinus that girl tile some tomgradations Willi groom and roll lights or with (lllltl'tlll: i-olorol lights in? is rcqliirml in known {Wow- (F505; of color photography it is, tlirrri011. :1 :lcrrillml wlvnratzigv in my H \?-lli'lll that lmli ol' liar miiiponvnt pint 2H (:ll: lw nmnigiw later} for tomgradation scpmwitwly. as for xzonplv to iotL-iisil' a m rwliiw tlw inmgv. This run llt' iumowgilislml in daylight lily liar usual motlioils 11ml tlw ii -mils: vliwkml up :li any momrnt ivy placing the lllilll'h ti'yggcllioi to View film i'lllllllilltlll llhfllL l 'lirllwrniorr. llwso fii'plil'll k galulrs urrll not lirllovtlogicil :ililm or um" willow-rimlllil ll lllly trczitml as i:= louml 'ulnlvto prollumlliclioot lone grill-lotion or mmtrol (mil gintlomost pious,- ing lth'iili lilo l lime sliown mr oizr iilir'l; arms in the illustrations giwii. will .u'rus uoulil of murals lw miulv up of grzulml iiiHHllltfS \s'llt'li lilac slzliirrt i'o l r i'rgil' niiai-wl i i llllllll of if? FiHiJllililHlf gri'xiilntions. "llac wzoailiw EIllfk logmpliircmulsion or lnyvz' is oi sin-l1 :i niiliuc no lo yiolil a,pproximnlvly corrwt gradations or opmitivs.

liming limo (lcwriliml in liHiElllOll, wiia'r, l claim :19 now illill (ltSli'l to arcliro by llvtlcrs lul'i-nl is:

1. In a photographic clmnrnt for use in color plmtograpliy the combination with a trunfilucid support of filter elements thereon. tliorc being windows :iuiiting Slllll liltcr clvnwnl. llllil liglit :sensilivc moolaion oppositr. mill windows to rccrivo light lilo Fttlirongli Pillfll rcparateil filter elvmont liemg of one rolol' throughout cntiri: arm.

9. .1 l ilmlogzmplaic vlrment for use in color illlul lfjllli'lij" mnsl ling of a truos lucnl i-llj lh port lowing sporcil tiller areas thereon ol it rolor romplri:auxiliary to tlmt of the color to lw rot-united, and having pliologmphic malrrial tlieroon lJtlWljPlJ til: filter areas one]. sensitized for and adapted to record as a broken photographic image, a given color value of a subject.

3. A photographic element for recording the component values of one oolor of an object, comprii ing a translucid support hav ing a screen thereon of one color substantially com ulemeutilry to will color of the object to he recorded and made up oi; color areas separutcil by uncolorm'l areas, and photographic material opposed to said 11n colored areas; and Sll'lhll'lZBtl to a color com Momentary to the i-olor' of the screen.

i. A photographic clrmenl; comprmmg a. tllUlF-[Hllinll support carrying a layer of ill ing thereon separated oolor areas adjacent: said layer and capable of preventing the transmission thorethrough of actinic light corresponding with that represented by the color value of the subject to be I'GCUIiliZl'l,

mutcrial sensitized and ailaptcsl for rm ortllog in scpzlriitcil sections ctweon llic fiitor areas that color voluc of tho sulijcot which is; romplemc'ntiiry to the color of .aid areas, said filter TENS preventing the pzwsogijtof :iclinic light to tlioso portions of tho it'll?- upon the filter areas that s l 1on1" l ons, being unaffected light, may oo ro rfiroovoe'l by the subsequent (lovoloping oporation. and thus have, clear llltiir spaces lmt'Wor-o the image portions.

ii. A pliotogmgiliiviilly SQllilliivi comporwnt for iinilm :2. monosolor rcronl of a snl jiri-t, tfiliipiflfllflg a transparent Sliflpnll rairryirm it layrr oi photographic inzitrr l i-nsilivo to a gii'on color and mloo'cil i". r -rorll tlw some wlor value of tho will a Slllll support clari ying ocparzitml lii'mis single color filltl in light obstructing rulition to the sciis 'itivo material and which liars will not transmit notinic light norrespooil- 112;: to said color value. said limos intr- Fpcrsml ill; ..'T which will l Plj'l llfiillv Fool liglili lo tiiu soositive matcrioh ulieiroli it llrolwn lincll inmgo recording a mono-color colon of tho F-flllljtfi may be iroiiucc-tl,

1'. it phot graphic oolor picture i lil 'nS- gnarl-m5 mmprismg small separato arras of plmtogi'upliio matcrial rccoriliog a color *mlisc of a subjrrrt in a broken image, each arm of wliirli lb adjacent to anal intcrspcii-orl with small color complementary in roior to that of the color value of said image, further .ieparatorl areas of photographic material opposite said color areas and hearing separated image portions recording a color value similar to the color of. said color areas and areas of color complementary to the other color areas opposite Said first mentinned image portions and intcrspersieil will) the second mentioned areas of photographic material, whereby earli image may on viewed through a filter similar in color to that of the color value of the subject represontoal in said image and the broke-o images nmy he nssoociatod in tlic eye as a complete color picture, and means for fillppofiiflg Sail] areas.

"llao mothoil of preparing 3 mm, iiic positive mlor record of o 531 ii-r powll groom color separation. negatives, printing the real color value negative on a photographic lowly sensitive to that color while scrssning; the printing light from separated of to? owly so to provide window spa-11's interspersed with image portions, printing; the grew-n oolor value negative on El iiiiotograpliir? borly sensitized to that color svreoniog the printing light from sep omit-:1 arms of said body to produce, il'na, *6 soil wins Jiiv auras, tho window areas on t 16 ion Thmlios being so located that, when the dios are: superposed with their developed fixer; images in rrgistry, the image on may ho viewed in part through the. wars oi the other, developing and fixin ioriiiivos and siiperposing the some ry as above.- sot forth wheroby each may he vimvvll through a rotor filter inding with tho (I or vallio thereof. o mri'imi at ai'ogmri o; El plmtoggrm iliiv rot-owl of a subject PGIIEPIlS- of making rfli 11ml green color 7 35 liililflf f tliv, rod color on a Wi l fnsitivs photo iiorly whilisvreoniiig tho printing tlio lmilv along; n-paratoii lines Iliiliifi u linoil positive image broken lyisi'oiloiv L printing the green color vniuo oogzo iii! on at positiw g H? sunsitivo lw the printio .gglit svhsiiiw body :iiong sop limos of the two liofliss al that whim tlir: bodies am with thoir images in ro ristro limo one. body will intori t 'tlw otlisr, iisveloping and fixing Filtti ztflt ltld l siaperpwsing the some in iwir r as 2. *o i xploiimii, so that each image may tin v [l through a filter corrospoml ig: iii color tllmowiili.

' ml of nothing :1 positive rotor vol-tr:

$1 so posit l i f tho steps of prom i 1mm 11 fi3tlv0 by light ivo upon a sonsi-- having areas of "vim" valoo (if i is imi'olorml woos iiotwsvsi to: in: and the QL'ELL iiit uniting oi the; body. so to li ht are word ii broken vwtivr: imtigzo on said body Wm: tlis spin 3.: livtavwii tho volor areas, iv preparing a, positivrwoorfl from onil negative through a similarly intorposeil second. srrPon 'ilitlvring from the first in that the arms of oolor of the soconil :n'o mmplumontiu'y to tlioso of the first, tho sol-owl swoon lI-Ril'lg: so positionml with rofvl ours to the nogutivo that its rolor areas cover portions of the negative image which corrospoml with portions of tlli other negative image that were not rowi'ml by the color areas of time first moutionml svroen, developing and tiring; said positive images and sun gatiw :4 V-

erposing the positives ai'icl screens with the images in registration and with the screens in the some? rolative relation tlioi'eto uswlien the sa d imagrs were light roc' rdoai.

ll. 'lhe mrtlioil of preparing a positives color reironl of a subject from two photograpl'iiczilly sensitive sr-reeo oomporientsi, each having iliere'on lines of a singli color complementary to the color of the liries on the otlwr, and separated by clear spaces covered with srnsitivo material, said method comprising the steps of making two color separ..ion negatives. of the subject, propzu-ing 1. pr itive image from one negative by ptkiltifllll i a light recording relation to said nege that sensitive soroen oomponent which bears a color oomplomrntary to the! o lor fillll oi the nrgatiu and light room-(ling ssizl neg: tivo as a broken positivv imoggs or for pavss only between said volor lin V g; 3 tlis sPeronll rri-eo vomimswi'it n :1 lig tt IQifll'lilfig relation to tho sworn? iwgotivo n In its lines at on magic on tho nv gotiw lll'iitifi to tlw dirovtion as su'rwl by th li? m illi list sorrow vomponent; the iwo nr-ggulivo iil flfili having the some relativ positions in Hlfll. (vase, ami'l liflflltl recording; the sm-omi negative as a broken positivo image only iwtvsesn the color limos on the lofifillil mmpone nt, (lovrloping); ixing owl f5. laiogg; 'isl positivo imiagvs and s11poriznposiifig the (*(iiiiponvnls with time images in rvgisiry to form a -olor rooorrL 12. "Elm pr s-: of making a positive phol jil1j)llli? r21 ml in i-olors, romprising the steps oi: Plifiifigfl'tlilllll'lg a: sulijset l tlzmngn a rod litter on a I'Pli sensitive plate, pi i graphing Husmm': subject tlir ugrli green filter on 31 n: s iisitl o lair. :lsvstoping um fixing tho mo, prizoaa positivo im rzl from tho first moo-M negative by 1 gig rod light tlierofrnio to a photornpliivzilly rm! sensitive body tl'iroiigli a col-i1," hfiiflfl mmprising giflifii liii alto? noting with isor lines to rooorrl the rest valor ml imu t in broken lliZi-S or: soul l i si n! "l r props 'ing a second positive ov-5M; i; l- ?h; HPi'nll'l mimw negatizi: h li lst train mitten? from the negative to o H .o sonsitiv boil v throng l2 a sore-on hav- Eng slti rnotiog rot and trimsgimeiit llfiiS or ra-mgrml at it velstiveiy ilitlor-rnt angle on the nrgntive from that oioupieil by the first named sq molar: H lmolaon image reo Ufll oi the L supports, one carrying fine, spaced, red lines and a layer of green sensitive material there over, the other carr ing fine, spaced, green lines and a layer ot red sensitive material, said method comprising the steps of superimposing the red color separation negative and a green lined component in a printing position with the color lines between the negative and the sensitive'material of the component and printing by red light a broken positive image in the clear spaces between the color lines, similarly superimposing the green separation negative in a printing position over a red lined component with the red lines between the negative and the sensitive material of the component and located at an angle to the direction of the green lines relative to the image during the printing operation, printing a broken positive image recording the green color values by means of green light, developing and fixing the positive images thereby removing the sensitive material behind the color lines to provide filter windows and superimposing the screen components with the images in registry and visible in part at least through the windows so that they may be associated in the eye as a complete picture.

14. A picture transparency having a partial image on one side regularly subdivided into spaces and ima e portions, and another partial image on t e other side regularly subdivided into spaces and image portions, the image portions on each side being backed with such respectively different colors as to additively produce a resultant color effect in projection.

15. A picture transparency having a partial color value image on one side regularly subdivided into spaces and image portions, and another partial color value image on the other side regularly subdivided into spaces and image portions, the image portions on each side being backed with a color correspending to the color value thereof.

In witness whereof I allix my signaturethis 3rd day of May, 1916, in the presence of two witnesses.

MARCUS C. HOPKINS \Vitnesses:

HUGH DAVIS, CLAYTON L. JENKS.

Certificate of Correction.

It is hereby certified that in Letters Patent No. 1,460,673 ranbed July 3, 1923 upon the application of Marcus (7. Hopkins. of Rochester, i ew York. for an improvement in Methods of Color lholxigraphy and Photographic Elements, an error appears in the printed specification requiring correction as follows: Page 8, line 119, claim 1.2, after the word screen insert. the. word lines,- and that. the said Letters Patent, should be read with this correction therein that the same may conform to the record of the case in the Patent Ofiiue.

Signed and sealed this 31st day of July, A. D., 1923.

l -1 KARL FENNING,

Acting Commissioner of: Patents. 

